Bollard Strength Check Calculator

Input Parameters

Material Properties

Steel yield stress, sy (MPa)

Weld yield stress (MPa)

Applied Forces

Force on bollard, F (T)

Factor of safety, SF

Vertical angle of force, θ (deg)

Height of force from top of base plate, Hp (mm)

Bollard Geometry

Outer diameter of bollard pipe, DO (mm)

Thickness of bollard pipe, tp (mm)

Base Frame Geometry

Outer length of base frame, LB (mm)

Outer width of base frame, WB (mm)

Thickness of base frame, tB (mm)

Height of base frame, HB (mm)

Weld Thickness

Weld between bollard pipe and base frame, tw1 (mm)

Weld between base frame and deck, tw2 (mm)

Bollard Assembly Diagram

Calculated Results

Allowable Stresses

Parameter	Value	Unit
Allowable bearing stress, sb	211.5	MPa
Allowable shear stress, ta	94.0	MPa
Allowable tensile stress, st	141.0	MPa
Allowable bending stress, sbend	155.1	MPa
Allowable Von Mises stress, sc	176.3	MPa
Allowable weld stress, sw	144.0	MPa

Bollard Pipe Strength Check

Design Forces and Moments

Parameter	Value	Unit
Design force on bollard pipe, FP	25.0	T
Horizontal force, FH	25.0	T
Vertical force, FV	0.0	T
Design moment on bollard, MP	12000.0	T-mm

Bollard Pipe Properties

Parameter	Value	Unit
Inner diameter of bollard pipe, DI	289.0	mm
Section area of bollard pipe, AP	17358.8	mm²
Section modulus of bollard pipe, ZP	1499260.4	mm³

Stress on Bollard Pipe

Parameter	Value	Allowable	Status
Shear stress, tS	14.1	94.0 MPa	OK
Axial stress, sT	0.0	141.0 MPa	OK
Bending stress, sB	78.5	155.1 MPa	OK
Von Mises stress, sV	86.9	176.3 MPa	OK

Weld Check (Bollard Pipe to Base Frame)

Weld Properties

Parameter	Value	Unit
Length of weld, Lw	1021.0	mm
Weld throat thickness, Sw1	14.1	mm
Weld area, Aw	14440.7	mm²
Section modulus of weld, Zw	372224.9	mm³

Stress on Weld

Parameter	Value	Allowable	Status
Shear stress on weld, tSW	17.0	144.0 MPa	OK
Tensile stress on weld, sTW	0.0	144.0 MPa	OK
Bending stress on weld, sBW	315.8	144.0 MPa	Fail
Total stress on weld, svw	316.3	144.0 MPa	Fail

Base Frame Strength Check

Design Forces and Moments

Parameter	Value	Unit
Design force on base frame, FP	25.0	T
Moment arm of horizontal force about base, HPB	605.0	mm
Design moment on base frame, MP	15125.0	T-mm

Base Frame Properties

Parameter	Value	Unit
Inner length of base frame, LBi	1276.0	mm
Inner width of base frame, WBi	406.0	mm
Section area of base frame, AB	12616.0	mm²
Section modulus about X-axis, ZBXX	16078571.4	mm³

Stress on Base Frame

Parameter	Value	Allowable	Status
Shear stress, tS	19.4	94.0 MPa	OK
Axial stress, sT	0.0	141.0 MPa	OK
Bending stress, sB	9.2	155.1 MPa	OK
Von Mises stress, sV	23.2	176.3 MPa	OK

Weld Check (Base Frame to Deck)

Weld Properties

Parameter	Value	Unit
Length of weld, Lw	3460.0	mm
Weld throat thickness, Sw2	7.1	mm
Weld area, Aw	24472.8	mm²
Section modulus of weld, Zw	124243.0	mm³

Stress on Weld

Parameter	Value	Allowable	Status
Shear stress on weld, tSW	10.0	144.0 MPa	OK
Tensile stress on weld, sTW	0.0	144.0 MPa	OK
Bending stress on weld, sBW	1192.7	144.0 MPa	Fail
Total stress on weld, svw	1192.8	144.0 MPa	Fail

Note: All calculations are based on AISC ASD standards. 1 T (metric ton) = 9806.6 N conversion factor is used for force calculations.

Important: The weld checks show "Fail" status with default values, indicating the weld thickness may need to be increased or the bollard design reconsidered.